The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

A memorial to the first person killed by a motor vehicle in the Western Hemisphere.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

New York City's only preserved family home from the 19th century.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This fancifully decorated Victorian home in New York’s Hudson Valley is the only known fully domed octagonal residence in the United States.

Hidden inside one of the world's most well-visited zoos is a secret plaque promising eternal life.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

Peek through the gates at this oasis from the city, full of Old English charm.

A Gothic-style abode built to accommodate the church's three resident peacocks.

The "Seinfeld" diner.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.